/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.io.hdfs;



import com.bff.gaia.unified.sdk.io.fs.ResolveOptions;

import com.bff.gaia.unified.sdk.io.fs.ResolveOptions.StandardResolveOptions;

import com.bff.gaia.unified.sdk.io.fs.ResourceId;

import org.apache.hadoop.fs.Path;



import java.net.URI;

import java.util.Objects;



import static com.bff.gaia.unified.vendor.guava.com.google.common.base.Preconditions.checkArgument;

import static com.bff.gaia.unified.vendor.guava.com.google.common.base.Preconditions.checkState;



/** {@link ResourceId} implementation for the {@link HadoopFileSystem}. */

class HadoopResourceId implements ResourceId {

  private final URI uri;



  HadoopResourceId(URI uri) {

    this.uri = uri;

  }



  @Override

  public ResourceId resolve(String other, ResolveOptions resolveOptions) {

    checkState(

        isDirectory(), String.format("Expected this resource is a directory, but had [%s].", uri));

    if (resolveOptions == StandardResolveOptions.RESOLVE_DIRECTORY) {

      if (!other.endsWith("/")) {

        other += "/";

      }

      return new HadoopResourceId(uri.resolve(other));

    } else if (resolveOptions == StandardResolveOptions.RESOLVE_FILE) {

      checkArgument(!other.endsWith("/"), "Resolving a file with a directory path: %s", other);

      return new HadoopResourceId(uri.resolve(other));

    } else {

      throw new UnsupportedOperationException(

          String.format("Unexpected StandardResolveOptions %s", resolveOptions));

    }

  }



  @Override

  public ResourceId getCurrentDirectory() {

    return new HadoopResourceId(uri.getPath().endsWith("/") ? uri : uri.resolve("."));

  }



  @Override

  public boolean isDirectory() {

    return uri.getPath().endsWith("/");

  }



  @Override

  public String getFilename() {

    return new Path(uri).getName();

  }



  @Override

  public String getScheme() {

    return uri.getScheme();

  }



  @Override

  public String toString() {

    return uri.toString();

  }



  @Override

  public boolean equals(Object obj) {

    if (!(obj instanceof HadoopResourceId)) {

      return false;

    }

    return Objects.equals(uri, ((HadoopResourceId) obj).uri);

  }



  @Override

  public int hashCode() {

    return Objects.hashCode(uri);

  }



  Path toPath() {

    return new Path(uri);

  }

}